package com.diko.ucenter.controller;

import com.diko.commonUtils.JwtUtils;
import com.diko.config.exceptionhandler.myException;
import com.diko.ucenter.entity.Member;
import com.diko.ucenter.entity.Member2;
import com.diko.ucenter.service.Member2Service;
import com.diko.ucenter.service.MemberService;
import com.diko.ucenter.utils.ConstantWxUtils;
import com.diko.ucenter.utils.HttpClientUtils;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpSession;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @author Emma Li
 * @date 2020/10/19 - 9:52
 */
@Controller
@CrossOrigin
@RequestMapping("api/ucenter/wx")
//@ConfigurationProperties(prefix = "wx.open")
public class WxApiController {

    @Autowired
    Member2Service member2Service;

//    @Value("${wx.open.app_id}")
//    private String openid;
//
//    @Value("${wx.open.app_secret}")
//    private String appSecret;
//
//    @Value(("${wx.open.redirect_url}"))
//    private String redirectUrl;


    @GetMapping("callback")
    public String callback(String code, String state, HttpSession session) {

        //得到授权临时票据code
        System.out.println(code);
        System.out.println(state);

        //从redis中将state获取出来，和当前传入的state作比较

        //如果一致则放行，如果不一致则抛出异常：非法访问

        //向认证服务器发送请求换取access_token
        String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
        "?appid=%s" +
        "&secret=%s" +
        "&code=%s" +
        "&grant_type=authorization_code";

        String accessTokenUrl = String.format(baseAccessTokenUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                ConstantWxUtils.WX_OPEN_APP_SECRET,
                code);

        String result = null;
        try {
            result = HttpClientUtils.get(accessTokenUrl);
            System.out.println("accessToken=============" + result);
        } catch (Exception e) {
            throw new myException(20001, "获取access_token失败");
        }

        //解析json字符串
        Gson gson = new Gson();
        HashMap map = gson.fromJson(result, HashMap.class);
        String accessToken = (String)map.get("access_token");
        String openid = (String)map.get("openid");

        //查询数据库当前用用户是否曾经使用过微信登录
        Member2 member2 = member2Service.getByOpenid(openid);
        if(member2 == null){
            System.out.println("新用户注册");

            //访问微信的资源服务器，获取用户信息
            String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
            "?access_token=%s" +
            "&openid=%s";
            String userInfoUrl = String.format(baseUserInfoUrl, accessToken, openid);
            String resultUserInfo = null;
            try {
                resultUserInfo = HttpClientUtils.get(userInfoUrl);
                System.out.println("resultUserInfo==========" + resultUserInfo);
            } catch (Exception e) {
                throw new myException(20001, "获取用户信息失败");
            }

            //解析json
            HashMap<String, Object> mapUserInfo = gson.fromJson(resultUserInfo, HashMap.class);
            String nickname = (String)mapUserInfo.get("nickname");
            String headimgurl = (String)mapUserInfo.get("headimgurl");
            Double gender=(Double)mapUserInfo.get("sex");

            //向数据库中插入一条记录
            member2 = new Member2();
            member2.setNickname(nickname);
            member2.setOpenid(openid);
            member2.setAvatar(headimgurl);
            member2.setAccessToken(accessToken);
            member2.setGender(gender==2 ?"女":"男");
            member2Service.save(member2);
        }


        // 生成jwt
        String token = JwtUtils.getJwtToken(member2.getId(),member2.getNickname());

//存入cookie
//CookieUtils.setCookie(request, response, "guli_jwt_token", token);

//因为端口号不同存在蛞蝓问题，cookie不能跨域，所以这里使用url重写
        return "redirect:http://localhost:3000?token=" + token;
    }

    @GetMapping("login")
    public String genOrconnect(HttpSession session){
        // 微信开放平台授权baseUrl
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
        "?appid=%s" +
        "&redirect_uri=%s" +
        "&response_type=code" +
        "&scope=snsapi_login" +
        "&state=%s" +
        "#wechat_redirect";

        // 回调地址
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL; //获取业务服务器重定向地址
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "UTF-8"); //url编码
        } catch (UnsupportedEncodingException e) {
            throw new myException(20001, e.getMessage());
        }
        // 防止csrf攻击（跨站请求伪造攻击）
        //String state = UUID.randomUUID().toString().replaceAll("-", "");//一般情况下会使用一个随机数
//        String state = "imhelen";//为了让大家能够使用我搭建的外网的微信回调跳转服务器，这里填写你在ngrok的前置域名
        String state = "http://emma.free.idcfengye.com";//为了让大家能够使用我搭建的外网的微信回调跳转服务器，这里填写你在ngrok的前置域名
        System.out.println("state = " + state);

        // 采用redis等进行缓存state 使用sessionId为key 30分钟后过期，可配置
        //键："wechar-open-state-" + httpServletRequest.getSession().getId()
        //值：satte
        //过期时间：30分钟

        //生成qrcodeUrl
        String qrcodeUrl = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                state);

        return "redirect:" + qrcodeUrl;
    }
}
